Chain



V{NoModelJ v Z'Sheets-,Sheet 1.

, W. A. DURRIN.

CHAIN.

No. 393,061. rPaemzed Nov. 20, 1888.

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2 Sheets-.Sheet 2.

f )(No. Mrodelg) W.A. DURRIN.

CHAIN.

Patented Nov. 20, 1888.

j UNITED STATES PATENT EEICE.

VARREN A. DUBBI-N, OF HERSEY, ASSIGNOR, BY DIRECT AND MESNE-AS SIGNMENTS, TO JAMES D. HILL, OF MENOMONEE, AND NOAH SHAW, OF

i EAU CLAIRE, WISCONSIN.

SPECIFICATION forming part of Letters Patent No. 393,061, dated November 2Ol 1888.

Application filed March 16, 1888. Serial No. 267.307. (No model.)

5 cousin, have invented certain new and useful Improvements in Chains; and I do hereby declare the following to be a full, clear, and eX- act description of the invention, such 4as will enable others skilled in the art to which it ap- 1c pert-ains to make and use the same.

My invention consists in an improved construction of a lockinglink between each pair of ordinary chain-links, whereby increased strength and durability with reduction of weight and cost of manufacture are secured and a chain is produced having spaces between its lockinglinks of size adapted for the admission of teeth of driving sprocket-wheels of a thickness and strength sufficient for with- 2o standing the great strain to wliieh'they are modified construction of the invention.

4o corners.

subjected while driving the chain.

In the accompanying drawings, Figure 1 is a plan view of a chain constructed in accordance with my invention. Fig. 2 is a View showing in central section one of the improved locking-links and in side elevation three ordinary chain-links and three of the improved locking-links. Fig. 3 is a plan, and Fig. 4 a vertical longitudinal section illustrating a Fig. 5 is a section in the line .fc zu, and Fig. 6 a section in the liney y,of Fig. 4. Fig. 7 is a vertical longitudinal section showing another modified construction of the invention and illustrating its use in connection ,with a sprocket-wheel.

In the accompanying drawings, A A represent ordinary sprocket-links of nearly a square form and rounded on their inner and outer Any other suitable form of chain links may be adopted.

B are locking-links between the links A A. The locking-links shown in Figs. 1 and 2 are respectively constructed of a link portion, a, an

4 5 abutting and supporting portion,b, a tie-clamping portion, c, and a rivet, d. The portions ab c are provided with a vertical central passage for the rivet d to pass through them. The link portion a has an opening, a', between its ends for the admission into it of the closed ends of the links A A. The abutment and supporting portion I) is of an inverted-T shape, and is slipped sidewise into the link portion c, its smaller or body part, b', passing through the opening a', while its larger or inverted head part,b,passes through the space inclosed by the link below said opening a', the upper and under side of its head part bearing firmly against the inner upper and lower surfaces of the said link portion a., and thus supporting the link portion, as shown. The ends of the inverted head part b2 of the portion b form the abutments for the links A A, and they are provided with segmental recesses b, so as to t the curved crosssectional form of the links A A and allow a free movement of the said links upon the link portion c, while to give lightness the under surface of the inverted head part may be hollowed out,as at b4. The body portion b of the portion b is made shorter than the thickness of the metal of which the link portion a is made, in order that the portions a b c may be compressed slightly, and thereby closely bound upon each other during the act of riveting them together. The tie-clamping portion cis formed with ribs c,while the link portion a is formed with grooves c2 on its upper surface for the reception of the ribs c. The tie-clamping portion is adjusted to the position shown after portion b has been slipped to its proper place, and then the rivet d is inserted through all of the portions and the whole riveted together, and by this riveting operation the portions Will be rmly bound together, and yet the links A A left free to articulate upon the open-link portion a.

In Figs. 3, 4, 5, and 6 I have shown that the body part b of the abutment and supporting portion b can be made longer than the thickness of the metal of the link portion c, and formed with a tapered extension, b5, and that the tie-piece c may be grooved at c5 to receive the extension bf', and formed with rivet ing-ribs c, while the link portion a is formed with matching grooves a5, the ribs and eXtensions of the said parts projecting beyond the sides of the link portion a, as well as beyond the'portions b and c,as shown at c7 band when the said portions and the links A A are brought together in substantially the sanne manner as hereinbefore described With respect to the construction shown in Figs. l and 2, and the projecting ends c7 b being upset,the Whole is thereby riveted together, so as to leave the links A A free to articulate on the link portion a of the locking-link B.

In Fig. 7 the locking-linkis shown with its portion designated by b and c in Fig. 2 as changed in shape and formed in one piece, as C, and provided with grooves d4 for rivets d5 to pass through, and constructed to under and over lap the ends of the portion et at the opening ct,while it bears against the lower inner surface of the portion a. The rivets d5 are passed through the grooves d4, and are upset or riveted against the sides of the portions et and C, as illustrated by the dotted circles d, which indicate the upset portions.'

What I claim isl. The combination,with chain-links, of the locking-link portion a, having an opening, a', the solid abutment and supporting portion b, of inverted-T form, one portion fitting in the opening a' and the other being Within the lock ing-link, the tie-clamping portion c, and the fastening for holding the parts together, all in the manner and for the purpose described.

2. Locking-link B, comprising the link portion a, having an opening, a, the solid abutment and supporting portion b, the tie-clamping portion o, and the rivet d, all riveted together upon the chain-links A A, substantially as and for the purpose described.

In testimony whereof I affix my signature in presence of two witnesses.

WARREN A. DURRIN.

Vitnesses:

W. H. ALLEN, ELMER J. NEWsoM. 

